Guard for knife-sharpening steels



,April 24, 1928.

P. D. CALLUM GUARD FOR KNIFE SHARPENING STEELS gym-"kw Gum/M Filed Sept.9, 1925 Patented Apr; '24, 1928;

UNITED "STATES PATIENTOFFICE-3 rrms'ronn QALLUM, or BALTIMORE, MARY AND)c GUARD r03 xnrrnsnnnrnnme STEELS. I V

applicatio fi l e iisentniber 9 seria "m. 55,210. I

This inventionrelates to improvements in guards, and more particularlytoguards tor knife sharpening steels.

butchers, coo-ks, servitors andthe" like for the sharpening ofbutchering, carving, serving and other knives aregenerally'defective inthat they provide no safety means, thus in the use thereof injury isoften inflicted to the hand and particularly to'the wristand knuckles.Suchinjuries' are occasioned by too long a stroke given to theknifeunden.

going sharpening the sli ping of the'knife from contact with the sarpemngsurtace,

or the holding hand. grasping the handle of a the sharpening steel toocloseto'the sharpening area.

an object of my invention is to overcome the existing defects inknvi'lteysharpening steels now in use by the production of a guard.which may be easily and'quickly attached or removed'aiiclflvill, whenattached or in use, efliciently pertorn all of' its intended functions.7 p Another object of my invention is to provide a guard for a knifesharpening steel so constructed and attached, as to*contribute a greater ease and co1nfort'tothe user as well as safety and efficiency inoperation. v

A further object of my invention is to provide a guard for aknife-sharpening steel so constructedand arranged aslto receive anddeflect the blow of'a knife'in sucha manner that noinjury will beimparted to the blade; and thatthe blade will be prevented from leavingthe guard. I

A still further obje'ctot my invention is to provide a guard for a"knife" sharpening steel'whi'ch has the advantagesof a positive guard,highly efiicient in' operation; and yet of such marked simplicity thatits'manu- :laeture may be economically facilitated. 1

The marked advantage of this invention is the production of a guard fora knife sh arpening steel susceptible of being applled to any sharpeningsteel now in use or any sharpening steel inthe manufacture"thereof,

the guard consisting primarily of a plate having a central aperture anda plurality appended claims. a y i In order to make my inventioninoreclearrollin of the lug upon itself of upon. its edgfeg the lugsbeing radially disposed and equally spaced with respect to each other.The lugs are rolled or folded upon themselves and pressed upon the platein such a manner as'to produce an abrupt parabolic curve on their innerfaces which will have tendency to deflect a knife blow an dto'catoh theblade in a groove which ls 'tformed betneenthe lug thus rolled oi-folded and the face of the plate. l

fVVitlr these and other objects in View which may be iucidentto myimprovements, I

the ii'ivention consists in theparts, and combinations to be hereinafterset 'forth- 'and claimed, with the understanding that the severalnecessary elements comprisingmy invention, may be varied inconstruction, proportions and arrangement Without depar-ungifmmthe/spirit and scope of the 1y understood, I have shownin theaccompanying drawings means vtor carrying the same into practlcal effectwlthout limiting the improvements in their useful applications to theparticular constructions, which for the purpose of: explanation, havebeen made the subject otillustration.

In the drawings forming a part of this specification: p i Figure l is aside elevation, of almife sharpening steel with my improved guardattached.

Fig. 2 is a sectional view takenon line 2- 2 Figure 1, looking inthedirection of the arrows, v V

Fig. 3 is asectional view taken on line 3-3 Figure 2 illustrating thefoldingor and the top or 12153 of the plate, and

'Fig. 4 is a plan vievvo'li a modified form beingshoivnin section.

Referring by numerals to the drawlngs 1 represents a l1andle,'wlnch mayhe of any ofs uardr the steel to which it is attached desired shape orform according to the fancy I of the producer. Mounted in the handleisknife sharpening steel ,2, the shank of which is passed through: aferrule 3. The ferrule 3 is fitted snugly upon the handle and forms a;collar around the steel- This construction is well known in implementsof this character, the size and minor details varying according to theirusage. The mplement here shown is a butchers or meat eutters steel.

In Figure 1, I have illustrated my improved guard as attached. The guardconsists of a disk or plate 4 of soft brass, varying in size accordingto the use to which the knife sharpener is to be put. This plate isformed of soft brass so as to absorb the blow with practically no injuryto either the knife blade or the guard should the knife come directly incontact therewith, and at the same time effectively guard the handholding the sharpening steel and prevent injury thereto.

The plate 4 is provided with a central aperture 5 conforming to the sizeofthe steel upon which the plate is to be placed so as to produce a snugfit. The plate l is slipped over the steel 2 and secured to the ferrule3 in any desirable manner. It may be formed as an integral part of theferrule, riveted or sweated thereupon. The plate a is provided -,with aplurality of radially disposed lugs 6 equally spaced with respect toeach other and to the central aperture. The lugs 6 are formed into stopsor buffers by folding or rolling the same inwardly upon themselves andpressing them tightly against the face of the plate in such a manner asto produce on their inner or ,oppositely dispo ed faces abrupt paraboliccurves 7. This curved surface has a tendency to deflect a knife blow. Infolding or rolling and pressing the lug 6 upon the face of the plate, aV-shaped groove 8 is formed. This groove is designed to receive the edgeof a knife blade deflected from the sharpening steel and to contributeto the effectiveness of the stop in retarding or preventing aknife bladefrom passing off the hand guard after the guard has absorbed the blow.

In Figure l, I have shown a modification of the guard which consists informing the plate 4: in the form of an octagon though it is to beunderstood that the same may be formed of a polygon having any number ofsides 9. The object is to prevent or retard a rolling motion of theimplement when placed upon any surface, such as a work bench'or worktable. At each of the angles formed on the edge by the particularconfiguration of the plate is a stop formed in the same manner as abovedescribed, the same being so shaped as to slightly bevel the angles, asindicated at 10 to avoid the presence of sharp abrasive edges.

l/Vhile I have shown and described the preferred embodiment of myinvention, I wish it to be understood that I do not con fine myself tothe precise details of construction herein set forth, by way ofillustration, as it is apparent that many changes and variations may bemade therein, by those skilled in the art, Without departing from 3. Ina guard for a knife sharpening steel,

a disk, and a plurality of members on the disk projecting at an acuteangle from the plane of the disk.

4. In a guard for a knife sharpeningsteel, a disk and a plurality ofmembers projecting at an angle from the edge of the disk.

5. In a guard for a knife sharpening steel, a substantially circularplate and a plurality of members projecting from the plane of the plate.

6. In a guard for a knife sharpening steel, a substantially circularplate having an aperture in the center thereof and a series of lugsprojecting at an angle from the edge of the plate.

7. In a guard for a knife sharpening steel, a disk having an aperture inthe center thereof and a plurality of bent lugs on the periphery of thedisk.

8. In a guard for a knife sharpening steel, a disk having an aperture inthe'center thereof, and a plurality of bent lug; upon the disk in spacedrelation to each other.

9. In a guard for a knife sharpening stee a disk having an aperture inthe center thereof, and a plurality of bent lugs upon the periphery ofthe disk in spaced relation to each other and to the aperture.

-10. In a guardfor a knife sharpening steel, a plate having an aperturein the center thereof, a plurality of lugs upon the periphery of theplate and the lugs turned upon the .face of the plate.

11. In a guard for a knife sharpening steel, a plate having an aperturein the center thereof, a plurality of radially disposed and equallyspaced lugsupon the edge of the plate, the lugs turned uponthe face ofthe plate and grooves between the lugs and the face of the plate.

12. In aguard for a knife sharpening steel, a plate having an aperturein the center thereof, .a plurality of radially disposed and equallyspaced lugs upon the edge of the plate, the lugs rolled upon the face ofthe plate, abrupt parabolic curves upon the inner faces of the lugs andslots between the lugs and the face of the plate.

In testimony whereof I affix my signature.

PRESTON D. OALLUM.

